My 12 week old daughter was sleeping 8-9 hours through the night for the last week, almost week and a half. Now this past weekend she’s been waking up every 3-4 hours and eating a ton but sleeping a lot of the day. Please someone tell me this is just a growth spurt and it will go back to normal. I am exhausted and back to work as of last week. I work long hours a couple days in a row and I feel like I’m losing my mind already. I exclusively pump and feed her breast milk. She normally eats 3oz every 2 hours but today she has been eating 3-5 and much more frequently during the day